Betensky, E. Zoom Lenses V. SPIE Digital Library.
Cita Chicago (17th ed.)Betensky, Ellis. Zoom Lenses V. SPIE Digital Library.
Cita MLA (9th ed.)Betensky, Ellis. Zoom Lenses V. SPIE Digital Library.
Atenció: Aquestes cites poden no estar 100% correctes.